Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
van pham » san pham, van phan, van phat
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((tu cach) or (tu cac))) or (su sach)) ky tang ma hoi. hieu van pham duc va thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu cach) OR (tu cac))) OR (su sach)) ky tang ma hoi. hieu van pham duc va thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((tu cach) or (tu cac))) or (su sach)) ky tang ma hoi. hieu van pham duc va thanh vai cua tre*.